Order Related Billing - must check PGI

Hi All ,

I have order related billing maintained, where billing type F1 is derived from billing plan in the sales order. When an order is made, we can do the invoice once billing plan tab  for f2 is maintained.

The requirement is that system should check the delivery and PGI first and then allow invoice.

Is there any way in standard. I have checked copy controls in vtfa and have assigned 34 routine (Item order-rel. GI) but no success.

Any help would be appreciated

Regards

Akber